Enabling VRR, ALLM, and other HDMI 2.1 Functions using the AC-MX-42X

Enabling VRR, ALLM, and other HDMI 2.1 Functions using the AC-MX-42X

Ensure Source, AC-MX-42X, and Display are powered on.

Accessing the Web GUI

The AC-MX-42X unit comes in DHCP by default. To find the IPv4 Address Assigned to the unit, Press and Hold OUT 2 and SCALER SET buttons for 5 seconds.

The IPv4 Address will be presented on the OLED screen.
From here type the IPv4 Address into your favorite browsers address bar.


Select the Tabs Button in the top left of the screen.


Select the I/O Config Tab

Once in the I/O Config Tab select the desired Inputs EDID Dropdown Tab.

Select USER1 EDID


In the HDMI Dropdown select the Desired Output to copy from. Ensure the display is connected and that any Deep Color or Enhanced Formats have been turned on.
Then select the Copy Button to save the EDID of the Display into the HDMI Input.


Ending Notes

Some Source devices may require a power cycle upon the dynamic EDID change. Some Source devices may require additional manual settings, not automatically enabled by the selection of an EDID. 


    • Related Articles

    • HDMI 2.1 Terms with Explanations

      HDMI 2.1 Terms Auto Low Latency Mode (ALLM) HDMI Video Flag that automatically sets the display into the lowest latency settings. Capabilities Data Structure (CDS) Describes Audio Capabilities of an eARC RX (Audio Playback Device) to an eARC TX ...
    • AC-MX-44 Firmware Release

      Firmware Downloads: https://firmware.avproedge.com Release Date: 02 MAR 2022 Current Version Information: MAIN MCU: 1.24 AUX MCU: 1.14 KEY MCU: 1.10 NET MCU: 1.18 MAIN FPGA: 2.04 SPHE AUD: 1.60 Release Notes: 02 MAR 2022:       NET MCU v1.18: Fixed ...
    • AC-MX-88HDBT Firmware Release

      Firmware Downloads: https://firmware.avproedge.com Release Date: 01 FEB 2022 Current Version Information: MAIN MCU: 1.10 AUX OUT MCU: 1.03 AUX IN MCU: 1.07 KEY MCU: 2.00 NET MCU: 1.08 FPGA: 1.23 SPHE AUD: 1.60 Release Notes: 01 FEB 2022:       NET ...
    • AC-MX-88 Firmware Release

      Firmware Downloads: https://firmware.avproedge.com Release Date: 03 FEB 2022 Current Version Information: MAIN MCU: 1.17 AUX MCU: 1.14 KEY MCU: 1.10 NET MCU: 1.07 MAIN FPGA: 2.06 SPHE AUD: 1.60 Release Notes: 03 FEB 2022:       MAIN MCU v1.17: ...
    • AC-MX-44HDBT Firmware Release

      Firmware Downloads: https://firmware.avproedge.com Release Date: 14 JAN 2022 Current Version Information: MAIN MCU: 2.34 OUT MCU: 2.11 IN MCU: 1.23 KEY MCU: 2.01 NET MCU: 1.20 FPGA: 2.32 SPHE AUD: 1.60 Release Notes: 14 JAN 2022:       MAIN MCU ...